Blocking remover as well as preparation method and application thereof

By preparing a water-soluble unblocking agent containing amide and ester compounds, the problems of agent safety and secondary emulsification blockage under high temperature conditions in deep shale gas wells were solved, achieving clean wellbore unblocking and efficient dissolution of composite blockages, suitable for the high temperature environment of deep shale gas wells.

CN122080897APending Publication Date: 2026-05-26CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Application Number
CN202411696099.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-25
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing unblocking agents have poor safety under high-temperature conditions in deep shale gas wells, and residual agent components can easily form secondary emulsion blockages, making it difficult to effectively remove bottom-hole emulsions and complex blockages.

Method used

A plugging agent is used, which consists of 10-25% amide compounds, 15-25% ester compounds, 5-50% co-solvents, 5-50% shale inhibitors, and 5-50% drainage aids. By modifying small molecule amides and small molecule esters, water-soluble, highly permeable solvents, a water-soluble, neutral cleaning and plugging agent suitable for use in deep shale gas wells is formed. It has strong solubility and dispersibility, high flash point, and is suitable for high-temperature environments.

Benefits of technology

It achieves wellbore cleaning and unclogging, reduces emulsion viscosity, prevents secondary emulsion blockage, ensures normal production of deep shale gas wells, has high safety and high efficiency in dissolving complex blockages, and is suitable for high-temperature conditions at the bottom of wells up to 150°C.

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Abstract

The invention relates to the field of oilfield chemistry, in particular to a blocking remover and a preparation method and application thereof. The blocking remover is prepared from the following components in percentage by weight: 10 to 25 percent of an amide compound, 15 to 25 percent of an ester compound, 5 to 50 percent of a cosolvent, 5 to 50 percent of a shale inhibitor and 5 to 50 percent of a discharge aiding agent. According to the preparation method of the blocking remover, conventional amides and small molecular ester substances are preferably synthesized, and hydroxyl groups, hydrogen bond groups and the like are introduced, so that good permeability and dissolving and dispersing capacity for blocking substances are reserved, the water solubility and the flash point are improved, and the construction operation safety is further improved. The blocking remover system not only has a flash point higher than 90 DEG C, ensures the use safety of a natural gas well, but also can keep stable performance in a high-temperature environment at the bottom of a well of 150 DEG C, meets the harsh conditions of deep shale gas exploitation, and provides powerful support for the development of deep oil and gas resources.
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